GroPoint Profile

GroPoint profile soil moisture sensor

GroPoint Lite

GroPoint Lite soil moisture sensor

GroPoint Pro

GroPoint Pro soil moisture sensor

GroPoint Classic

GroPoint Classic soil moisture sensor

GP-DU Handheld Sensor Reader

GP-DU Handheld soil moisture meter

Bluetooth Sensor Pod

Bluetooth sensor pod wireless soil data collection

GroPoint CloudConnect

GP-DU Handheld soil moisture meter

GroPointLite

Accurate and reliable analog or digital soil moisture probe


The GroPoint™ Lite soil sensor is robust, reliable and highly accurate, providing cost effective soil moisture and temperature measurements. The sleek, lightweight design installs quickly with minimal soil disruption. When installed vertically, the sensor averages volumetric moisture content over a soil layer of about 6” (15cm). When installed horizontally, the sensor can be used to measure moisture at a specific soil depth.

GroPoint Lite can be deployed in irrigation-sensitive zones, such as around the root zone, to enable full control of precision irrigation needs.


  • Moisture readings can be user-calibrated with 3rd-order polynomials to meet custom requirements.
  • Low power requirements—suitable for remote, autonomous applications.
  • Patented TDT5 technology for scientific-grade accuracy and excellent long-term stability of measurements.
  • Fully potted electronics for excellent durability.

Analog Version

Moisture

Measurement range

0% to 100% of VMC

Accuracy

±1.0% *

Precision

< 0.2%

Electrical

Interface

0-5 mA, 4-20 mA

Connection

Bare wire
Optional EN3 3-pin IP66/IP68 rated environmental connector

Warm-up time

< 100 ms

Input voltage

6 to 14 VDC, max. 18 VDC

Current consumption

0-5 mA: 18 mA (nominal), 25mA (max)
4-20 mA: 30mA (nominal), 50 mA (max)

Environmental

Operating temperature

-20°C to 70°C (-4°F to 158°F)

Storage temperature

-40°C to 85°C (-40°F to 185°F)

Physical

Dimensions

19.6 cm x 2.0 cm x 0.56 cm (7.7” x 0.8” x 0.2”)

Weight (with standard cable)

272 g (0.6 lb.)

Cable weight

38 g per m (0.42 oz. per foot)

Standard cable

5 m (16.40 ft.)
3xAWG22 dual-shielded, twisted pair, rated for direct burial

Warranty

1-year limited parts and labour

* 8% to 42% VMC, in controlled laboratory conditions; factory calibrated for most agricultural soils. In field applications, accuracy may slightly decrease due to the inevitable heterogeneity of soil texture, soil compaction, moisture and fluctuation in soil temperature. The accuracy may also decrease in difficult soil conditions (higher clay and salinity content). In normal conditions, GroPoint sensors will maintain their accuracy from permanent wilting through field capacity in sandy loam through clay soils with less than 60% clay particles. Under moderately saline conditions. GroPoint sensors will maintain their accuracy up to 6 ds/m.

Digital Version

Moisture

Measurement range

0% to 100% of VMC

Accuracy

±1.0% *

Precision

< 0.2%

Temperature

Measurement range

-20°C to +70°C (-4°F to 158°F)

Accuracy

±0.5 °C

Electrical

Interface

SDI-12, RS-485

Connection

Bare wire
Optional EN3 4-pin IP66/IP68 rated environmental connector

Warm-up time

< 1 second

Input voltage

6 to 14 VDC, max. 18 VDC

Current consumption

Quiescent: <0.1 mA
Active: 15-35 mA

Environmental

Operating temperature

-20°C to 70°C (-4°F to 158°F)

Storage temperature

-40°C to 85°C (-40°F to 185°F)

Physical

Dimensions

19.6 cm x 2.0 cm x 0.56 cm (7.7” x 0.8” x 0.2”)

Weight (with standard cable)

272 g (0.6 lb.)

Cable weight

38 g per m (0.42 oz. per foot)

Standard cable

5 m (16.40 ft.)
4xAWG22 dual-shielded, twisted pair, rated for direct burial

Warranty

1-year limited parts and labour

* 8% to 42% VMC, in controlled laboratory conditions; factory calibrated for most agricultural soils. In field applications, accuracy may slightly decrease due to the inevitable heterogeneity of soil texture, soil compaction, moisture and fluctuation in soil temperature. The accuracy may also decrease in difficult soil conditions (higher clay and salinity content). In normal conditions, GroPoint sensors will maintain their accuracy from permanent wilting through field capacity in sandy loam through clay soils with less than 60% clay particles. Under moderately saline conditions. GroPoint sensors will maintain their accuracy up to 6 ds/m.

Is it compatible with all data loggers?

Yes, GroPoint Lite will work with virtually any data logger. Just ensure your data logger will handle the output of your GroPoint Lite sensor (whether analog or digital).

Can it be used as a portable solution?

No, GroPoint probes are meant to be used on a permanent or semi-permanent basis. There should be minimal disturbance of the surrounding soil for proper accuracy.

What kind of soils can it be used in?

GroPoint Lite probes can be used in virtually any soil.

Does it need to be calibrated for different soil types?

GroPoint probes are factory-calibrated for use in most soils. There are also two other standard calibrations that can be used, which you can specify when you order. Below is an image of a standard soil texture triangle. By default, calibration is done for a wide variety of soil types represented by the red area. You can also request that your sensor is calibrated for clay or highly saline soil (the green area) or sandy soils (blue area).
Soil moisture probe
Custom calibration can be done at our facility upon request. End customers can also perform their own calibration (documented in the User Manual).

If I use a sensor calibrated for a different type of soil than I have, will I lose accuracy?

If you're using a sensor with the wrong calibration, measurements will have a small absolute/relative error, read either too high or too low by up to 4%.

Can the sensor cable be buried, and is it durable enough to be left exposed on the surface of the ground?

GroPoint sensors are furnished with a high quality cable suitable for direct burial or exposure to direct sunlight. It is resistant to damage from insects, abrasion and normal environmental exposure. However, mechanical damage from hoes, coyotes, gophers, other animals, and cultivators can easily cut this cable. Any problem with this sensor will most likely be due to damage to the electrical cable. To prevent damage, it is strongly recommended that the cable be installed in 3/4-inch electrical conduit. This size conduit is required to accommodate the passage of the plug connector.

What is the maximum length of cable that can be used with the sensor?

According to the SDI-12 specification, the combined length of all sensors connected to a data logger cannot exceed 610 m (2,000 feet). So one sensor with a 610 m cable or 10 sensors each with a 61 m cable.

Can I use my own cable to extend the length of the standard cable?

Custom cable lengths can be ordered from us, or cable may be spliced by the customer. Each cable has three wires. The cable must be 22 gauge copper or larger.

All connections should be made inside a waterproof box using silicone filled, waterproof, wire nut connectors. These waterproof connectors are available at local electrical/hardware suppliers, such as The Home Depot.

Why is it so accurate? Most soil sensors I see are only accurate to 3%.

GroPoint sensors feature an accuracy rating of < ±1% (< ±0.01m3m-3) volumetric soil moisture, between the range of 8% to 42% VMC (this is the normal range for agricultural applications). We obtain this accuracy through a patented technique which improves the performance of the already reliable TDT method of soil moisture measurement. This patented technology is called TDT5, which you can read about here.

While the < ±1% accuracy rating is achieved in controlled laboratory conditions, GroPoint sensors are factory calibrated for most agricultural soils. In field applications, accuracy may slightly decrease due to the inevitable heterogeneity of soil texture, soil compaction, moisture and fluctuation in soil temperature. The accuracy may also decrease in difficult soil conditions (higher clay and salinity content). In normal conditions, GroPoint sensors will maintain their accuracy from permanent wilting through field capacity in sandy loam through clay soils with less than 60% clay particles. Under moderately saline conditions, GroPoint sensors will maintain their accuracy up to 6 ds/m.

What is TDT5? How does it differ from other soil measurement methods?

TDT5 is a proprietary technology based on Time Domain Transmission (TDT), which is a refined version of Time Domain Reflectometry (TDR). TDT measures the time taken for an electromagnetic wave to propagate (travel) along a given length of a transmission line in the soil. Moisture in the soil changes the soil’s dielectric properties, so that the electro-magnetic wave travels at different rates in wet soil compared to dry soil. This allows for the accurate determination of the soil moisture content.

However, we add our own engineering designs that result in a less expensive, more robust and more accurate (with greater repeatability) sensor than with pure TDT alone. This enhances TDT in five (hence "TDT5") key ways:

  1. Measures with an antenna 5 times longer than the physical length of the probe, to reduce the impact of noise - boosts accuracy to ±1% and repeatability to < 0.2%
  2. Filtering 400,000 pulses for each measurement - boosts accuracy to ±1% and repeatability to < 0.2%
  3. Captures measurement in less than 100ms - reduces power consumption
  4. Embeds antenna and circuitry on a single board - dramatically reduces cost to manufacture
  5. Encases entire sensor in a durable, sealed polycarbonate housing - maximizes durability

You can learn more about TDT5 here.

I'm not in BC, Canada. Can I buy and obtain support for GroPoint products locally?

GroPoint has dealers in several international locations as well as across Canada. You can find your local dealer on the Dealers page.

GroPoint products are also sold online and we offer several self-help support resources, as well as unlimited support via phone, email and online chat.

What is the area of influence for the sensor?

The GroPoint Lite sensor measures the average soil moisture along its active length about 15 cm (6"), which is 3 cm (1.25") from the top and 2.5 cm (1") from the bottom of the sensor, whether the sensor is installed vertically or horizontally. Under most conditions, the sensor’s active range extends about 10 cm (4") out from the side of the sensor, and 2.5 cm (1") from the tip.

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The GP-DU handheld display gives immediate readings from an analog moisture sensor, displaying the volumetric moisture content as a percentage.

Retrieve data from one or multiple in-situ SDI-12 probes wirelessly, using your smartphone.

Extend the standard 5m cable of your GroPoint sensor. Choose the additional length to add to the standard 5 m length.

Weight: 38 g/m | 0.026 lb/ft


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Soil moisture sensor product catalog